The series was sold in Japan across 13 DVDs and VHS tapes containing 4 episodes each (bar volume 13, which had only 3). Do they contain special features? Who knows! You're lucky to find any information about what's actually on the discs. They retailed for around 4700 to 5000 Yen, and the resale value hasn't risen a great deal for most of the volumes, though it's still funny money to be paying for a measly four episodes. Could be worse, though!
4Kids' unfinished English dub of the series was broadcast only on television and their website for a short period, and never saw home release. Bitty home-recordings with massive watermarks are all that's available of them online as of this writing.

These episode recaps are based off the subs by Dreadopp and Zedopp, kindly uploaded on YouTube, which is currently the only complete translation of the series.